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REFLEGTOR FOR ARG LIGHTS.` No. 479,189. Patented 111151 19, 1899.

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UNITED STATES PATENT OFFICE.

ROBERT S. DOBBIE, OF BROOKLYN, ASSIGNOR TO THE EDISON GENERAL ELECTRICCOMPANY, OF NEIV YORK, N. Y.

REFLECTOR FOR ARC LIGHTS.

SPECIFICATION forming part of Letters Patent No. 479,183, dated July 19,1892.

Application iiled April 8, 1891. Serial No. 388,104. (No model.)

.To all whom t may concern:

Be it known that I, ROBERT S. DOBBIE, a citizen of the United States,residing at the city of Brooklyn, in the county of Kings and State ofNew York, have invented a certain new and useful Improvement inReilectors or Intensiers for Arc Lights, of which the following is aspecification.

The invention relates to arc lamps of that 1o class in which an arc isformed between carbons placed end to vend and in which a refractorymaterial is placed near the arc and is rendered incandescent thereby.

The object of the invention is to provide I5 an improved form andarrangement of apparatus of the character indicated; and the inventionconsists in the features of construction and in the combinationshereinafter set forth and claimed.

go Figure l is a central section of a portion of arc lamp embodying myimprovement, and Fig. 2 is a similar View of a slightly-modified form.

1 1 are portions of two arc-light carbons.

z5 The feeding mechanism is not shown, since any suitable mechanism forthis purpose may be employed, it only being necessary that the arcshould be maintained at the focus of the reflector.

3o 2 is a cast-iron or other metal casing, and within it is a hollowinsulating body or lining 3 of {ire-clay, porcelain, or other suitablematerial capable of resisting a considerable degree of heat and whichserves to localize the 3 5 heat around the terminals of the carbons.

Through the casing and through the porcelain body are openings 4 for thecarbons, the opening in the casing being larger than the opening in theporcelain, so that the carbons 4o cannot come in contact with the metalcasing to form a short circuit.

5 is a bracket for supporting the device. In the body 3, directly behindthe arc, is a socket or recess, within which is held a cylinder, sphere,or block 7 of lime or other re` fractory material capable of becomingincandescent. This block has a surface in proximity to the arc, but doesnot interfere with the feeding of the carbons.

8 is a screw having a milled head for hold- 5o ing block 7 in place andfor allowing adjustment thereof. Vhen the arc is established between l1, the heat of the arc is communicated to '7, rendering that portion ofit behind the arc incandescent and greatly adding to the brilliancy ofthe light. The porcelain or similar body closely surrounding the arc andthe cylinder 7 conserves the heat and adds to the brilliancy of thelight.

The several parts of the apparatus in Fig. 6o 2 are lettered tocorrespond with Fig. 1', the main difference between the two formsconsisting in the arrangement of the block 7.

In Fig. 2 the cylinder is shown with an end facing the arc and restingin the opening 6, which extends entirely through the refractory body orlining, instead of being placed with a rounded side toward the arc. Thecylinder '7 (shown in Fig. 2) may, if desired, have the end facing thearc curved, as indi- 7o cated by the dotted line 9.

Having thus described the invention, what I claim is- 1. Thecombination, with a hollow refractory body, of lamp-carbons forming anarc within said body, a socket therein, and a refractory block adaptedto become incandescent supported in said socket, substantially asdescribed.

2. The combination, with a hollow refrac- 8o tory body having a socket,of lamp-carbone forming an arc within said body, a refractory block inthe socket and near the arc, adapted to become incandescent, and meansfor securing said block and for adjusting the same, substantially asdescribed.

This specification signed and witnessed this 3d day of April, 1891.

ROBERT S. DOBBIE. lVitnesses:

CHARLES M. CATLIN, J. A. YOUNG.

